CCTV drain survey London are becoming more and more necessary as many mortgage lenders are requiring them prior to the approval of loans. It is also very good practice if you are looking to buy any property if you want to avoid any expensive repair bills for blocked or collapsed drains. Of course leaking drains can cause more than damage to just themselves, permanent damage could also be inflicted on the foundations of the house also.cctv drain surveys londoncctv surveys londoncctv drain surveys in London